Hi lookandbuyme,
Thanks for checking back in with us about this. As you mentioned, our engineering team is working on the issue causing the shipping services not to show up on the new preview page, as well as a number of other issues with that page, but we are unable to offer a specific estimate of when they will be resolved at the moment.
Since these issues are limited to the preview page and do not impact how your listings will look once posted to eBay, I don't feel it is necessary to wait until they are addressed to resume posting your listings to eBay. However, you are certainly welcome to do so if you wish.
I will follow up with you through your open support case on this subject when we are able to get the preview page issues resolved or I can get an estimate of when that will happen. I fully expect that we will focus on correcting these issues instead of rolling back to the old preview page.
-Mike